What's Wrong with My Homemade Yogurt?

Q: I make my own yogurt every week. Regardless of the starter culture I use, once in a while, the yogurt develops a stringy, elastic texture. Can you explain this?

Sent by Klaudia

Editor: My guess is that you're getting either wild yeast or bacteria in your yogurt as it cultures. To prevent this, make sure to heat your yogurt to around 200°F, then cool it to around 115°F before adding the culture. It also helps if you can keep the yogurt above 100°F as it cultures.